need help with a Holley carb

if you are feeling ambitious , slap an eddy on there and see how it runs and what it does when you shut the car off. is that the same carb used on the dyno? fuel fouled plugs will be black and sooty. oil fouled will be black and wet. Ive pulled some ugly plugs out of engines that were running fine, I don't think that would cause it to pop out the carb